.container {
    width: 100vw;
    height: 100vh;
    display: flex;
    /* 登录框居中（上下） */
    align-items: center;
    /* 登录框居中（左右） */
    justify-content: center;
    /* fixed 让背景图像不随页面滚动 */
    background: url("../image/bg.jpg") fixed no-repeat;
    /* 背景图片等比例缩放 */
    background-size: cover;
}
.loginForm {
    width: 340px;
    height: 400px;
    display: flex;
    flex-direction: column;
    padding: 40px;
    text-align: center;
    position: relative;
    z-index: 100;
    background: inherit;
    border-radius: 18px;
    overflow: hidden;
}
.loginForm::before {
    content: "";
    width: calc(100% + 20px);
    height: calc(100% + 20px);
    position: absolute;
    top: -10px;
    left: -10px;
    overflow: hidden;
    background: inherit;
    box-shadow: inset 0 0 0 200px rgba(0, 0, 0, 0.25);
    filter: blur(5px);
    z-index: -1;
}
.loginForm .suep-logo {
    width: 180px;
    height: 45px;
    margin-left: 60px;
    background: url("../image/suep_logo.png") no-repeat;
    /* 隐藏文字 */
    font-size: 0;
}
.loginForm h2 {
    color: white;
    display: block;
    margin-bottom: 30px;
    padding-bottom: 10px;
    border-bottom: 2px solid white;
}
.loginForm input, .loginForm button {
    margin: 6px 0;
    height: 36px;
    width: 250px;
    border: none;
    background-color: white;
    border-radius: 4px;
    padding: 0 24px; /* 让框内提示字里边框远点 */
}
.loginForm button {
    display: block;
    margin-top: 24px;
    margin-left: 44px;
    background-color: red;
    color: white;
    cursor: pointer;
}
.yzm {
    margin-left: 120px;
    width: 100px;
    height: 50px;
}